I was on an ASA CRJ from ATL to TOL and it was freezing. It was April. Was 80 in ATL and 80 in Toledo and I put on a long sleeve shirt and had a blanket (which they ran out of blankets, so I gladly gave mine up to a female passenger).
Another thing about the CRJ was the flight attendant made me give up my seat at the wing and window seat to sit in an aisle seat next to the bathroom to "balance the aircraft". I must have been in front of the center of gravity, but still. I had to give up my window seat which kind of ticked me off. The whole reason I book flights months in advance is so that I can get a window seat, not to sit next to the bathroom.
But to answer your question. Every RJ I have been on has been cold. But then so has every Saab 320 and Dornier 380. So who knows